Mỹ: Tai nạn khinh khí cầu ở bang Arizona, khiến 4 người thiệt mạng
Ủy ban An toàn Giao thông quốc gia (NTSB) của Mỹ cho biết khinh khí cầu bị rơi do trục trặc ở lớp vỏ; trước khi rơi, khinh khí cầu đã bay lên và hạ xuống theo phương thẳng đứng.
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